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Issue 40, 2013
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Surfactant-assisted synthesis of mesoporous silica/ceria–silica composites with high cerium content under basic conditions

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Abstract

Ordered mesoporous silica/ceria–silica composites were synthesized using cerium(IV) hydroxide and tetraethyl orthosilicate (TEOS) as co-precursors in the presence of hexadecyltrimethylammonium bromide (CTAB) under basic conditions. These composites consisted of Ce-doped mesoporous silica particles (about 500 nm) with highly ordered 2D hexagonal (p6mm) and 3D bicontinuous cubic (Ia3d) structures and irregular ceria-rich silica–ceria particles. Wide angle XRD, diffuse reflectance UV-vis, and XPS analyses showed that 10–24% of cerium was at the Ce3+ oxidation level and the remaining predominant fraction of Ce was at the Ce4+ oxidation level. The cerium loading was varied in these composite materials up to 43 wt% (∼3.1 mmol g−1). The specific surface areas of the mesoporous silica/ceria–silica composite samples obtained on the basis of nitrogen adsorption isotherms were higher than 350 m2 g−1 and their pore widths were between 3.3 and 3.5 nm. The mesoporous silica/ceria–silica samples were reduced at 850 °C under flowing H2 in a N2 environment. The crystal structure of the reduced samples changed to a hexagonally structured phase with the oxidation state of Ce3+, while the ordered mesostructure of silica was preserved.

Graphical abstract: Surfactant-assisted synthesis of mesoporous silica/ceria–silica composites with high cerium content under basic conditions

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Publication details

The article was received on 25 Jun 2013, accepted on 19 Aug 2013 and first published on 19 Aug 2013


Article type: Paper
DOI: 10.1039/C3TA12482G
J. Mater. Chem. A, 2013,1, 12595-12605

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    Surfactant-assisted synthesis of mesoporous silica/ceria–silica composites with high cerium content under basic conditions

    E. Cho, S. Yim, D. Kim and M. Jaroniec, J. Mater. Chem. A, 2013, 1, 12595
    DOI: 10.1039/C3TA12482G

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